1 delete all the versions on you pc
2 download the .20 version from the link above
3 connect your player in msc mode only (not any other choice)
4 unzip the .20 version to the root of your player
5 disconnect your player
6 turn it off
7 turn it on and allow fw upgrade to proceed

I don't know if it was moving the actual zipped file into the root menu before unzipping it, or if it was restarting my computer, or if I just got really lucky, but it appears to be back to normal. Thanks so much for the help. Any idea what I was messing up?